981953849 has 4 divisors (see below), whose sum is σ = 982021236. Its totient is φ = 981886464.

The previous prime is 981953807. The next prime is 981953857. The reversal of 981953849 is 948359189.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 510760000 + 471193849 = 22600^2 + 21707^2 .

It is a cyclic number.

It is not a de Polignac number, because 981953849 - 2¹² = 981949753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 981953794 and 981953803.

It is not an unprimeable number, because it can be changed into a prime (981953449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1724 + ... + 44349.

It is an arithmetic number, because the mean of its divisors is an integer number (245505309).

Almost surely, 2^981953849 is an apocalyptic number.

It is an amenable number.

981953849 is a deficient number, since it is larger than the sum of its proper divisors (67387).

981953849 is a wasteful number, since it uses less digits than its factorization.

981953849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67386.

The product of its digits is 2799360, while the sum is 56.

The square root of 981953849 is about 31336.1428545378. The cubic root of 981953849 is about 993.9480642935.

The spelling of 981953849 in words is "nine hundred eighty-one million, nine hundred fifty-three thousand, eight hundred forty-nine".